. Carnegie Institution of Washington publication. ' Fig. ioa. Fig. iob. the case of this particular fusion. The preceding and certain of the follow- ing fusions make it altogether probable that a fusion of the two skeletons did not take place, but that the mesenchyme cells migrated from one part of the body to another, as in figures 5, 6, 8, and 9, or from one body into the other, as in figures 7 and 10. On comparing figures 7 and 10, ic will be observed that the supernumerary rod in both originated in the same region, is much branched, extends from one larva into the other, dififering o
. Carnegie Institution of Washington publication. ' Fig. ioa. Fig. iob. the case of this particular fusion. The preceding and certain of the follow- ing fusions make it altogether probable that a fusion of the two skeletons did not take place, but that the mesenchyme cells migrated from one part of the body to another, as in figures 5, 6, 8, and 9, or from one body into the other, as in figures 7 and 10. On comparing figures 7 and 10, ic will be observed that the supernumerary rod in both originated in the same region, is much branched, extends from one larva into the other, dififering only in the matter of length, and finally that they replace the suppressed parts of the skeleton of the weaker larva. The close similarity in these respects is significant and supports the view of a redistribution of the mesenchyme cells and the subsequent outgrowth of the hypertrophied rods into the second larva. Figure 11, which is somewhat enlarged, might be mistaken for a single larva with a supernumerary arm. On closer examination it will be found that there are clearly two larvae fused very completely together. One of these, the dominant or A pluteus, has the characteristic four arms, perfect 8. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1910, bookyear1914
